基于围岩松动圈数值模拟的穿层钻孔测压结果分析
Results Analysis of Pressure Testing for Through Beds Hole Based on Numerical Modeling of Surrounding Rock Loose Circle
-
摘要: 针对试验矿井穿岩钻孔测压结果严重偏低的现象，采用Comsol Multiphysic软件对试验矿井测压地点围岩的塑性区进行了模拟，结果表明当巷道距煤层最短距离小于7 m时，围岩松动圈裂隙已与煤层贯通。此种情况下，常规的水泥砂浆封孔不能满足测压封孔要求，松动圈内围岩裂隙与测压气室沟通泄压是导致测压结果偏低的主要原因，此时应选用“两堵一注”带压封孔方法，且封孔压力不小于6 MPa。Abstract: According to the fact that the measuring pressure in the test mines by cross rock drilling is much lower than its adjacent mine, a numerical simulation is applied to analyze surrounding rock plastic zone in test site by Comsol Multiphysic software. The results show that when the shortest distance of the roadway is less than 7 m from the seam, the surrounding rock loose circle has been passed through the seam. In the case，it can not meet the requirements by use of conventional cement mortar sealing under pressure, and the main reason caused the lower pressure test results is decompression of the cracks passing through surrounding rock loose circle and the pressure chamber. So we should choose the pressure sealing method of "two ends blocking and middle injection", and the injection pressure must be more than 6 MPa.
-
-
[1] 俞启香.矿井瓦斯防治[M].徐州:中国矿业大学出版社,1992：208. [2] 周世宁，林柏泉.煤层瓦斯赋存与流动理论[M].北京：煤炭工业出版社，1992. [3] AQ1047-2007煤矿井下煤层瓦斯压力的直接测定方法[S]. [4] 周昀涵，罗新荣，吴丽丽.上向孔直接测定瓦斯压力新技术研究及应用[J].中国煤炭，2011,37（8）：93-96. [5] 高宗飞，周福宝，刘应科，等.松软易塌孔煤层顺层钻孔测压技术[J].煤炭技术，2010,29（1）:109-111. [6] 张小波，赵光明，孟祥瑞.基于Drucker-Prager屈服准则的圆形巷道围岩弹塑性分析[J].煤炭学报，2013（S1）：30-37. [7] 万串串.松动圈理论在地下深部层状围岩支护中的应用研究[D].长沙：中南大学，2012. [8] 李世平.岩石力学简明教程[M].徐州:中国矿业大学出版社,1986．
计量
- 文章访问数: 294
- HTML全文浏览量: 0
- PDF下载量: 0
下载:
